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Contemporary Research QCA9-33 にも：インストレーション・マニュアル (11 ページ)

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Installation

Basic Setup

The QDA4-45 is designed for QMOD applications, but can be used with other RF channels at similar levels.

Use only the included 12 VDC power supply, do not use with shared 4 or 6 amp DC power supplies.

Connect one source to Input 1



Connect to the In 1 RF Input (not 2-3)



Select Input 1 on the front panel



Adjust gain up and down, 0 – 32 dBmV, add in input level for total RF level. For example to amplify one QMOD (typical 29

dBmV) to 45 dBmV, add +16 dB of gain. For amplifying QCA9-33 Active Combiners that are fed from QMODs (typical 32

dBmV), add +13 dB for a 45 dBmV level output.

Connect up to four sources or QCA9-33 Active Combiners to Inputs 1-4



Connect to the Inputs 1-4



Select All on the front panel



Adjust Gain up and down, 0 – 25 dB, add in input level for total RF level. The gain setting compensates for the 7 dB loss in the

combiner, so you just add the gain setting to the input level. For example to amplify four QMODs (typical 29 dBmV) to 45

dBmV, add +16 dB of gain.

RF Amp Out

The QCA9-33 accepts up to 38 dBmV RF level, and can amplify up to +50 dB.

RF Levels

If the RF level is too strong, the TVs can act as if there is no RF signal.



The input RF level and the QDA gain level should not exceed 50 dBmV; the goal is to average about 45 dBmV or less. If the

total gain is too strong, the amplifier can be overloaded, which could appear as No Signal to TVs.

If you're combining one to four QMODs, the gain should be no more than 16-20 dB

If you're combining one to four QCA9-33s, the gain should be no more than 13-17 dB



The RF level at the TVs should be about 0 to 20 dBmV. Digital RF channels are very flexible, and we've found that some TVs

can receive the channel at about 29 dBmV. However, if the RF level to TVs is too high, the TVs can respond as if there is no

signal.

2-Way Operation

The QD4-45 is not designed for 2-way operation, but that could be performed using 2 sub-channel diplexers.

Contemporary Research

QDA4-45